Respond to the "request login" callback with some user-supplied credentials.
@param request_id The unique ID of the request.
@param username The username supplied by the user.
@param password The password supplied by the user.
See Implementation
Respond to the "request login" callback with some user-supplied credentials.
@param request_id The unique ID of the request.
@param username The username supplied by the user.
@param password The password supplied by the user.